This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A087608 #5 Feb 28 2014 05:21:57 %S A087608 17,227,1117,11117,333337,1000051000051000051000051000051000057, %T A087608 11111117,222222227,4444444447,66666666667,888888888887, %U A087608 1000101000101000101000101000101000101000101000101000101000101000101000107,191919191919191919191919197,222222222222227 %N A087608 Primes arising in A087605, or 0 if A087605(n) = 0. %Y A087608 Cf. A086920, A087604, A087605, A087606, A087607, A087609, A087610. %K A087608 base,nonn %O A087608 1,1 %A A087608 _Amarnath Murthy_, Sep 18 2003 %E A087608 a(6) corrected according to A087605(6) and more terms from _Michel Marcus_, Feb 28 2014